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b=4
c=20
V=a*b*c
V=3*4*20= 12*20=240
a=3cm
b=4cm
H=20cm
Pp= ab
Pp=4*3
Pp=12cm²
V=12 * 20
V=240cm³
Proszę.
V= ⅓*12*20
V= 80 cm³